Well im not realy know what youre talking about.I never ever had any bad feeling after smoking a Bong,except when i had drunk Alcohol before then i sometimes feel bad and had to puke,but thats from the Beer not the Weed.
Well,you know that when you have "some % of brain illness in your DNA" they can cause some trouble when smoking Weed.When for example your Grandmother had a Brain-Illness and you smoke Weed there is high chance you get that Brain-Illness too.
As i was a young smoker of 14 or 15,a guy which was 16 smoked a Bong at me.He then got crazy,climbed up my clothes-locker and doesnt wanted to climb down again.Well we then brought him to his Home,and next Day i heard they brought him to Hospital and he ended in the "Landeskrankenhaus" which is a nice word for "Lunatic Hospital" for some Days...
He had this Brain-Illness Grandmother Problem too.
I also know People who took so many Chemical Drugs,specialy LSD/Mushrooms,when they smoke 1 Bong they get extreme Flashbacks and feel like they took a bottle of Lsd or a forest of Mushrooms..Seems to be a Girl´s Problem,cause from 3 People i know who have this Problem are all 3 Girls.
If you mean with Paranoia some strong fear from something and its realy a problem for you,then i would suggest you buy yourself some Diazepam or Bromazepam Pills on the Blackmarket for Emergency on strong Paranoia Attack.(Can be bought normaly where Heroin is sold..Train Stations,Parks..1-2 Euros per 10/6 MG).They should solve this Problem

.They remove any fear feelings and also let you feel very very relaxed.